The Nicky Grist/Quinton, Woodpecker & Cambrian (though that did move to mid February for a few years) are the only events that are on a similar date as 15-20 years ago. All the rest have been moved;

25 Mar - Rally North Wales - Mid/late October.
15 Apr - Rallynuts Stages Rally - Late May/early June.
20 May - Plains Rally - Mid/late September.
8 Jul - Nicky Grist Stages
9 Sep - Woodpecker Stages
14 Oct - Wyedean Rally - Early February.
28 Oct - Cambrian Rally

And I recall the Red Kite being early/ mid January when run in the Epynt forests. Then in April when in Brechfa & Trawscoed in 2010.